It has been with some fascination that I have read the letters of Dr Butchart in recent issues as he has tried to argue that the phenomenon of regression to the mean (RTM) has no practical relevance in the estimation of the effectiveness of speed cameras (Letters LTT 19 Feb & 04 Mar).
He has, at various points, described the methods of analysis employed by Professor Allsop, myself and others as “black magic” and “arcane” (although I’m sure the students I...
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